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June 12, 2018 22:48
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<section> | |
<h2>1. '' 空の結果</h2> | |
<table> | |
<tr> | |
<th>$var値</th> | |
<th>isset</th> | |
<th>empty</th> | |
<th>is_null</th> | |
</tr> | |
<tr> | |
<th>$var = ''<?php $var = ''; ?></th> | |
<td><?php var_dump( isset( $var ) ); ?></td> | |
<td><?php var_dump( empty( $var ) ); ?></td> | |
<td><?php var_dump( is_null( $var ) ); ?></td> | |
</tr> | |
</table> | |
</section> | |
<section> | |
<h2>2. ' ' 空白の結果 </h2> | |
<table> | |
<tr> | |
<th>$var値</th> | |
<th>isset</th> | |
<th>empty</th> | |
<th>is_null</th> | |
</tr> | |
<tr> | |
<th>$var = ' '<?php $var = ' '; ?></th> | |
<td><?php var_dump( isset( $var ) ); ?></td> | |
<td><?php var_dump( empty( $var ) ); ?></td> | |
<td><?php var_dump( is_null( $var ) ); ?></td> | |
</tr> | |
</table> | |
</section> | |
<section> | |
<h2>3. NULL の結果 </h2> | |
<table> | |
<tr> | |
<th>$var値</th> | |
<th>isset</th> | |
<th>empty</th> | |
<th>is_null</th> | |
</tr> | |
<tr> | |
<th>$var = NULL<?php $var = NULL; ?></th> | |
<td><?php var_dump( isset( $var ) ); ?></td> | |
<td><?php var_dump( empty( $var ) ); ?></td> | |
<td><?php var_dump( is_null( $var ) ); ?></td> | |
</tr> | |
</table> | |
</section> | |
<section> | |
<h2>4. 整数 0 の結果 </h2> | |
<table> | |
<tr> | |
<th>$var値</th> | |
<th>isset</th> | |
<th>empty</th> | |
<th>is_null</th> | |
</tr> | |
<tr> | |
<th>$var = 0<?php $var = 0; ?></th> | |
<td><?php var_dump( isset( $var ) ); ?></td> | |
<td><?php var_dump( empty( $var ) ); ?></td> | |
<td><?php var_dump( is_null( $var ) ); ?></td> | |
</tr> | |
</table> | |
</section> | |
<section> | |
<h2>5. 文字列 '0' の結果 </h2> | |
<table> | |
<tr> | |
<th>$var値</th> | |
<th>isset</th> | |
<th>empty</th> | |
<th>is_null</th> | |
</tr> | |
<tr> | |
<th>$var = '0'<?php $var = '0'; ?></th> | |
<td><?php var_dump( isset( $var ) ); ?></td> | |
<td><?php var_dump( empty( $var ) ); ?></td> | |
<td><?php var_dump( is_null( $var ) ); ?></td> | |
</tr> | |
</table> | |
</section> | |
<section> | |
<h2>6. boolean TRUE の結果</h2> | |
<table> | |
<tr> | |
<th>$var値</th> | |
<th>isset</th> | |
<th>empty</th> | |
<th>is_null</th> | |
</tr> | |
<tr> | |
<th>$var = true<?php $var = true; ?></th> | |
<td><?php var_dump( isset( $var ) ); ?></td> | |
<td><?php var_dump( empty( $var ) ); ?></td> | |
<td><?php var_dump( is_null( $var ) ); ?></td> | |
</tr> | |
</table> | |
</section> | |
<section> | |
<h2>7. boolean FALSE の結果</h2> | |
<table> | |
<tr> | |
<th>$var値</th> | |
<th>isset</th> | |
<th>empty</th> | |
<th>is_null</th> | |
</tr> | |
<tr> | |
<th>$var = false<?php $var = false; ?></th> | |
<td><?php var_dump( isset( $var ) ); ?></td> | |
<td><?php var_dump( empty( $var ) ); ?></td> | |
<td><?php var_dump( is_null( $var ) ); ?></td> | |
</tr> | |
</table> | |
</section> | |
<section> | |
<h2>8. 空の配列の結果</h2> | |
<table> | |
<tr> | |
<th>$var値</th> | |
<th>isset</th> | |
<th>empty</th> | |
<th>is_null</th> | |
</tr> | |
<tr> | |
<th>$var = array()<?php $var = array(); ?></th> | |
<td><?php var_dump( isset( $var ) ); ?></td> | |
<td><?php var_dump( empty( $var ) ); ?></td> | |
<td><?php var_dump( is_null( $var ) ); ?></td> | |
</tr> | |
</table> | |
</section> | |
</div> |
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